OK, today I took the H6 to resolve the screeching problem from the drive belt. To reiterate, the sound would disappear upon application of a belt dressing but would reappear the next AM.
I got the oil changed while there. They troubleshot the screeching belt and replaced it under warranty. I was there for 35 minutes. I was impressed. The dealer is Norwood Subaru in Massachusetts. They said the belt was defective; they said it was glazed.
Now I'm surprised the belt was glazed after only 12300 miles. And it was not loose as the H6 uses an automatic belt tensioner.
Stay tuned.
Al